TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The solvent contains water-soluble ether solvent or water-soluble ketone and water. The content of water is 30-99.9 (preferably 50-99.9, especially 80-99.9) wt.% based on the entire solvent. The content of the organic amine compound is 50-500 mol % based on a carboxyl group contained in the resin. The organic amine compound is selected from secondary amine compound and tertiary amine compound. The boiling point of the organic solvents is less than or equal to 160 degrees C. The boiling point of the organic amine compound is 60-200 degrees C.    TECHNOLOGY FOCUS - POLYMERS - Preferred Method: In the method (M1), the adding of an organic amine compound, after the resin is formed, water is added to the solvent so as to separate the resin from the solvent, and water and the organic amine compound are added to the rest in which a portion of the solvent obtained after the separation is removed. In the method (M1), adding of an organic amine compound, after the resin is formed, an organic amine compound is added to the rest remaining after a portion of the solvent is distilled away or added to the rest while a portion of the solvent is being distilled away. Preferred Components: The resin includes a resin having an amino group on its terminal. The number average molecular weight of the resin is 1000-100000. EXAMPLE - Preparation of polyimide precursor composition was carried as follows: 360 g of tetrahydrofuran (THF) and 40 g of water are filled in a flask equipped with a stirring rod, a thermometer, and a dropping funnel, and 41.23 g of 4,4'-diaminodiphenylether (molecular weight of 200.24) was added to that under a flow of dried nitrogen gas. The mixture was stirred while the solution temperature was kept at 30 degrees C, and 58.77 g of 3,3',4,4'-biphenyltetracarboxylic dianhydride was slowly added to that, and then the mixture was further reacted for 24 hours while the reaction temperature was kept at 30 degrees C to obtain polyimide precursor solution (S1). Then 35.62 g of dimethylaminoethanol (molecular weight of 89.14) and 400 g of water were added to the polyimide precursor solution (S1) under stirring to obtain polyimide precursor composition.