Abstract: Heat resource is one of the important factors for agriculture. In order to give scientific bases to build protected agriculture, seed bases, vegetable bases, forest and fruit bases, and also provide bases for exploitation and use of climatic resources of mountainous areas on the basis of previous work, using cloud cover correction method, equations of 1 km×1 km gridding were set up for different ensurance probabilities(85%, 90%, 95%) of month mean temperature, month mean highest temperature and lowest temperature to calculate heat resources in Beijing area. On the basis of stated work, ≥0℃ and ≥10℃ accumulated temperature were calculated. And geographical distribution of various heat resource were given. And the calculating errors were analyzed.