NOVELTY - A flexible hyperbranched semi-interpenetrating fluorinated polysiloxane polyimide film is prepared from a triamido compound, a dyhydroxy-diamino compound, diamine, dianhydride and a silane compound. The dianhydride is 5,5'-(1,1,3,3-tetramethyl-disiloxane)norbornene anhydride, 1,1,3,3-tetramethyl disiloxane-bis benzoic acid anhydride or alpha , beta -bis benzoic anhydride - polydimethylsiloxane. The content of dimethylformamide solution is 20%, and has viscosity of 17-280000 cps at 20 degrees C.    USE - Flexible hyperbranched semi-interpenetrating fluorinated polysiloxane polyimide film used in fields of flexible printed circuits, liquid crystal display and photovoltaic energy sources.    ADVANTAGE - The flexible hyperbranched semi-interpenetrating fluorinated polysiloxane polyimide film has low dielectric constants, moisture rate and coefficients of linear expansion.    DETAILED DESCRIPTION - A flexible hyperbranched semi-interpenetrating fluorinated polysiloxane polyimide film is prepared from a triamido compound, a dyhydroxy-diamino compound, diamine, dianhydride and a silane compound. The dianhydride is 5-(2-(1,3-dioxo-1,3-dihydro-2-benzofuran-5-yl)propan-2-yl)-1,3-dihydro-2-benzofuran-1,3-dione, 5-(1-(1,3-dioxo-1,3-dihydro-2-benzofuran-5-yl)-1-phenylethyl)-1,3-dihydro-2-benzofuran-1,3-dione, 12,12-dimethyl-2,7,17-trioxapentacyclo(11.7.0.03,11.05,9.015,19)icosa-1(13),3,5(9),10,14,19-hexaene-6,8,16,18-tetrone, 12-methyl-12-phenyl-2,7,17-trioxapentacyclo(11.7.0.03,11.05,9.015,19)icosa-1(13),3,5(9),10,14,19-hexaene-6,8,16,18-tetrone, 5-(4-((1,3-dioxo-1,3-dihydro-2-benzofuran-5-yl)oxy)-2,3,5,6-tetrafluorophenoxy)-1,3-dihydro-2-benzofuran-1,3-dione, 5-methyl-6-(6-methyl-1,3-dioxo-1,3-dihydro-2-benzofuran-5-yl)-1,3-dihydro-2-benzofuran-1,3-dione, 5-(4-(2-(4-((1,3-dioxo-1,3-dihydro-2-benzofuran-5-yl)oxy)phenyl)propan-2-yl)phenoxy)-1,3-dihydro-2-benzofuran-1,3-dione, 2-methyl-5,11-dioxatricyclo(7.3.0.03,7)dodeca-1,3(7),8-triene-4,6,10,12-tetrone, 5,5'-(1,1,3,3-tetramethyl-disiloxane)norbornene anhydride, 2,8-dimethyl-5,11-dioxatricyclo(7.3.0.03,7)dodeca-1,3(7),8-triene-4,6,10,12-tetrone, 1,1,3,3-tetramethyl disiloxane-bis benzoic acid anhydride or alpha , beta -bis benzoic anhydride - polydimethylsiloxane. The diamine is 3-(3-amino-5-methylphenoxy)-5-methylaniline, 5-methylbenzene-1,3-diamine, 4-(2-(4-aminophenyl)propan-2-yl)aniline, 3-(2-(3-aminophenyl)propan-2-yl)aniline, 4-((4-aminophenyl)(phenyl)methyl)aniline, 2-amino-5-(2-(4-amino-3-hydroxyphenyl)propan-2-yl)phenol, 4-(4-amino-2-methylphenyl)-3-methylaniline, 2,3,5,6-tetrafluorobenzene-1,4-diamine, 2,4,5,6-tetrafluorobenzene-1,3-diamine, 4-(4-(4-aminophenoxy)-2,3,5,6-tetrafluorophenoxy)aniline, 4-(4-amino-2,3,5,6-tetrafluorophenyl)-2,3,5,6-tetrafluoroaniline, 4-(4-amino-2,3,5,6-tetrafluorophenoxy)-2,3,5,6-tetrafluoroaniline, 4-(4-(4-(4-aminophenoxy)-2,3,5,6-tetrafluorophenyl)-2,3,5,6-tetrafluorophenoxy)aniline, 4-(4-(2-(4-(4-aminophenoxy)phenyl)propan-2-yl)phenoxy)aniline or of formula (I)-(VI). The content of dimethylformamide solution is 20%, and has viscosity of 17-280000 cps at 20 degrees C.    Rf=-CF3-OCF3-CF2CF2H5;    R=1-5C alkylene;    R1-R8=H, 1-5C alkyl, 7-12C arylene or arylene-7-12C alkyl;    n=1-10;and    m=2,5,6 or 9.    An INDEPENDENT CLAIM is included for preparation of flexible hyperbranched semi-interpenetrating fluorinated polysiloxane polyimide film, which involves preparing linear polyamic acid containing fluorine or fluorine and silicon and hyperbranched polyamic acid containing hydroxyl groups, then reacting hyperbranched polyamic acid containing hydroxyl groups with hydrolysis product of silicate ester and silane coupling agent, obtaining branched polymer containing a crosslinking silica component, then mixing the branched polymer and the linear polyamic acid, forming a film through extrusion, coating and curtain coating, and carrying out amination and high-temperature heat treatment.