the top surface of the substrate using the invention method described it is possible to easily and quickly produce biological polymer chips such as dna chips having uniform quality 0016 fig1 shows an apparatus for producing the biological polymer chips such as dna chips using the aforementioned method the invention apparatus comprises a capillary 1 a capillary holder 2 substrate 3 and voltage source 4 a plurality of capillaries 1 are mounted on capillary holder 2 in an array and having the same interval of spacing u201c p u201d a dna solution 5 for example is then injected into each capillary 1 the type of capillary used for this purpose has the inside diameter u201c d u201d that prevents the solution 5 from spilling out of the capillary bottom end under natural conditions the plurality of capillaries 1 are mounted vertically on capillary holder 2 so that the bottom ends thereof are flush with one another on the same horizontal plane a substrate 3 is a part used to produce a dna chip for example and a top surface thereof is formed so as to be planar substrate 3 is arranged so that the top surface thereof is parallel to the bottom ends of capillary 1 either capillary holder 2 or substrate 3 or both are disposed to be vertically mobile so that a gap therebetween can be varied as desired a voltage source 4 is used to supply voltage across capillary holder 2 and substrate 3 for example a positive voltage is supplied to substrate 3 and a negative voltage is supplied to capillary holder 2 when voltage is applied an electric field acts upon the biological polymer sample such as dna solution 5 inside capillary 1 thereby causing the dna solution to swell below the bottom end.