The status of oil, water and gas in some oil wells in North China has been analysed. It is considered that there were immediate earthquake precursors prior to the magnitude 5.3 earthquake of Lulong. The anomalous variations were respectively initiated from two to five prior to earthquake in oil wells, such as well No.647 of Qikou, well No.11 and No.12 of Tanggu and well No.11 of Dazhongwang. The anomalous amplitude increased to 1-3 times higher than that of the normal background level. The sudden changes in which the amplitudes were even fifteen times higher than the level prior to shock, occurred half before the earthquake in the well No.18 of Tanggu. In the study the emergent mechanism for variations of oil, water and gas status is discussed. It is proposed that the best of observation procedure for examining the tectonic stress of the pusher type well is to datermine the pressure of the closed well.