A hydrophilic organopolysiloxane composition of the hydrosilylation reaction cure type for use as dental impression material, comprising as essential components, a diorganopolysiloxane having on average at least 0.1 silicon-bonded alkenyl group in a molecule, 5 to 50 parts by weight, per 100 parts by weight of component, of a liquid or solid organopolysiloxane having the average compositional formula: R p SiO (4-p)/2 wherein R is each independently a substituted or unsubstituted monovalent hydrocarbon group, alkoxy or hydroxyl group, 0.1 to 80 mol% of the entire R being alkenyl, and p is a positive number satisfying 1 ≤ p < 2, said organopolysiloxane comprising SiO 2 units and R 3 SiO 1/2 units with a molar ratio of R 3 SiO 1/2 units to SiO 2 units of from 0.5:1 to 1.5:1 and having a viscosity of at least 10 mPa-s at 23°C, an organohydrogenpolysiloxane having at least two silicon-bonded hydrogen atoms in a molecule, a hydrosilylation catalyst, and a polyether having the average compositional formula: R 1 O(C 2 H 4 O) m (C 3 H 6 O) n R 1 wherein R 1 is a group C 3 H 6 SiR 2 k (OR 2) 3-k or a monovalent hydrocarbon group, R 2 is a monovalent hydrocarbon group, k is 0, 1, 2 or 3, a plurality of R 1 and a plurality of R 2 may be the same or different, at least two of R 1 and R 2 are alkenyl, m is an integer of 0 to 100, n is an integer of 0 to 350, and m+n is an integer of 3 to 350, said component being present in an amount of 10 to 100 parts by weight per 100 parts by weight of components,, and combined. a diorganopolysiloxane having on average at least 0.1 silicon-bonded alkenyl group in a molecule, 5 to 50 parts by weight, per 100 parts by weight of component, of a liquid or solid organopolysiloxane having the average compositional formula: R p SiO (4-p)/2 wherein R is each independently a substituted or unsubstituted monovalent hydrocarbon group, alkoxy or hydroxyl group, 0.1 to 80 mol% of the entire R being alkenyl, and p is a positive number satisfying 1 ≤ p < 2, said organopolysiloxane comprising SiO 2 units and R 3 SiO 1/2 units with a molar ratio of R 3 SiO 1/2 units to SiO 2 units of from 0.5:1 to 1.5:1 and having a viscosity of at least 10 mPa-s at 23°C, an organohydrogenpolysiloxane having at least two silicon-bonded hydrogen atoms in a molecule, a hydrosilylation catalyst, and a polyether having the average compositional formula: R 1 O(C 2 H 4 O) m (C 3 H 6 O) n R 1 wherein R 1 is a group C 3 H 6 SiR 2 k (OR 2) 3-k or a monovalent hydrocarbon group, R 2 is a monovalent hydrocarbon group, k is 0, 1, 2 or 3, a plurality of R 1 and a plurality of R 2 may be the same or different, at least two of R 1 and R 2 are alkenyl, m is an integer of 0 to 100, n is an integer of 0 to 350, and m+n is an integer of 3 to 350, said component being present in an amount of 10 to 100 parts by weight per 100 parts by weight of components,, and combined. wherein R 1 is a group C 3 H 6 SiR 2 k (OR 2) 3-k or a monovalent hydrocarbon group, R 2 is a monovalent hydrocarbon group, k is 0, 1, 2 or 3, a plurality of R 1 and a plurality of R 2 may be the same or different, at least two of R 1 and R 2 are alkenyl, m is an integer of 0 to 100, n is an integer of 0 to 350, and m+n is an integer of 3 to 350, said component being present in an amount of 10 to 100 parts by weight per 100 parts by weight of components,, and combined.