Abstract: This paper presented here deals with the effect efficiency in fruitfulness of control pollination among different cultivars．The data obtanied in this Study indicates that most of olive cultivars exhibit low fruit setting as selfpollination．But fruitfulness can be obtained if optimum pollinators are used． Cross pollination between different cultivars varied on fruit setting which shows a difference in cross-compatibility．It was noted however，there is non-relationship between germination rate of pollen on stigma and cross-compatibility．The effects of reciprocal cross in most of olive cultivars are different only a few of them appeare to be similarly．Therefor it is necessary to screen the results of reciprocal cross between various cultivars．To identify cross-compatibility of most cultivars grown in same region and find out better pollinators for new olive plantation cross test in large scale are needed．Based on Statistical analysis of data obtained cross-comhinations between cultivars planted now in Chenggu county can be divided into four groups having different level of CROSS-compatibility(from the best to bad)．Thus，to establish olive plantation in Chenggu region must select the cultivars from the best and better groups as a major cultivar and pollinator that will give more promise to maintain the production of olive plantations at a high level.