The atmospheric transmittance database for 1064nm laser is created basing on the FASCODE.The model atmosphere is midlatitude summer. The slant path length covers (0~10)km with the alternation of 0.1km. The elevation covers 0°~90° with the alternation of 5°.The surface range covers (5~20)km with the alternation of 1km. The database could be enlarged easily. As the transmittance curves being analyzed,a few of data dots shows abnormal that the transmittance swell a little as the path length increasing. So that a bug is found in FASCODE.A rectifying program is compiled to eliminate the abnormal data dots with the help of artificial selection. The eliminated dots are replaced by cube C spline interpolation. The renewed database could be used expediently for iterative computering,which is often confronted in the researches of laser guide weapon training or photoelectricity countermeasure emulate system.