TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The content of halogenated olefin monomer in primary monomer is 0.1-49 wt.% with respect to the total content of halogenated olefin monomer in the primary monomer and secondary monomer. The primary monomer and secondary monomer contains fluoromonomer (a). The secondary monomer contains non-fluorine crosslinkable monomer (d), and does not contain non-fluorine non-crosslinkable monomer (c). The primary monomer contains non-fluorine non-crosslinkable monomer (c). The fluoromonomer (a) is of formula: CH2=C(-X)-C(=O)-Y'-Z-Rf. The halogenated olefin (b) is 2-20C olefin substituted by chlorine atom, bromine atom, or iodine atom, preferably vinyl chloride, vinyl bromide, vinyl iodide, vinylidene chloride, vinylidene bromide, or vinylidene iodide, more preferably vinyl chloride. The non-fluorine non-crosslinkable monomer (c) is a monomer does not have a crosslinkable functional group (excluding fluorine atom), and has carbon-carbon double bond. The non-fluorine non-crosslinkable monomer (c) is of formula: CH2=CA-T, preferably acrylate of formula: CH2=CA1COOA2. The non-fluorine crosslinkable monomer (d) has at least two reactive groups and/or carbon-carbon double bond, and does not contain fluorine. The weight ratio of halogenated olefin (b) in primary monomer and halogenated olefin (b) in secondary monomer is 3-97:97-3. The water and oil repellent composition further contains aqueous medium. The water and oil repellent composition is aqueous dispersion liquid.X=H, monovalent organic group, or halo, preferably H, 1-21C optionally branched alkyl, fluoro chloro, bromo, iodo, CFX1X2, cyano, 1-21C optionally branched fluoroalkyl, (un)substituted benzyl or (un)substituted phenyl;X1,X2=H, fluoro, chloro, bromo, or iodo;Y'=-O- or -NH-;Z=direct bond or bivalent organic group, 1-10C aliphatic group, 6-18C aromatic, cycloaliphatic group, -CH2CH2N(R1)SO2-, -CH2CH(OZ1)CH-2-, -(CH2)m-SO2-(CH2)n- or -(CH2)m-S-(CH2)n-;Rf=1-20C optionally branched fluoroalkyl;R1=1-4C alkyl;Z1=H or acetyl;n=1-10;m=0-10;A,A1=H, methyl, chloro, bromo or iodo;T=H, 1-30C linear or cyclic hydrocarbyl, or 1-31C linear or cyclic organic group having ester bond, preferably 12-30C long-chain hydrocarbyl or saturated cyclic hydrocarbyl;A2=alkyl of formula: Cn'H2n'+1, preferably 12-30 alkyl;andn'=1-30.The number of carbon in the fluoroalkyl group of the fluoromonomer (a) is 6 or less.    TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: The primary polymer further comprises non-fluorine non-crosslinkable monomer (c) and non-fluorine crosslinkable monomer (d) in addition to fluoromonomer (a). The secondary polymer comprises fluoromonomer (a) or non-fluorine crosslinkable monomer (d) in addition to halogenated olefin (b). Preferred Process: The polymerization reaction of secondary polymer is initiated during the polymerization of primary polymer, or the polymerization reaction of secondary polymer is initiated after completing polymerization reaction of primary polymer. The polymerization reaction of secondary polymer is initiated after completing 10% or more, preferably 70% or more polymerization reaction of primary monomer.