We present the data of photoelectric photometric observations of BW Vul carried out for four nights during the period of $1982{sim}1984$. The light curves with asymmetric shape show a stillstand on the ascending branch at phase of ${phi}{approx}0.85$ just before the maximum light, and also the ampitude and shape of light curves are changed from night to night. Using all the published data, a new ephemeris of maximum time is derived, in which the period of light variation is $P=0^d.20102977$ and its increasing rate is 2.2 see/century.