The invention relates to the comprehensive technical field of gas reservoir geology, gas reservoir engineering, economical evaluation and the like, and provides a well pattern optimizing method of a tight gas reservoir. The method comprises the steps that based on starting pressure gradient, it is indicated that the well pattern spacing is greater than the economic limit spacing Dmin and smaller than twice of the reservoir limit drainage radius, and the well pattern spacing is finally determined according to internal benefit demands. According to the method, the pressure spread range is considered on a sand body static model, a reservoir used border is made clear, and the optimal tight gas reservoir developing well pattern is achieved. The western area of Sulige gas field is taken as the example, the final yield is improved to 42% or above from the original 35% through well pattern optimizing, in the middle area of the Sulige gas field with better reservoir geological conditions, the yield reaches up to 50%, and a big step forward is made in tight gas excavation.