The computation of a micro-pitting load capacity of gears for wind power is carried out by a model based on the numerical thermal elastohydrodynamic lubrication (TEHL) contact theory. The difference of local lubricant film thickness and safety factor against micro-pitting between TEHL and ISO/TR 15144—1 are compared. The oil film pressure distributions, film shapes, temperature distributions are calculated under some varied points on the path of contact. The results show that calculation of micro-pitting load capacity of gears of wind power based on TEHL contact theory is feasible; the local lubricant film thickness calculated by TEHL contact theory is less than by ISO/TR 15144—1; and it is unnecessary to consider the pressure distributions and contact pattern change caused by TEHL when determining the modifications of main gears of wind power using loaded contact analysis.