In order to solve the problem of low a ccuracy of video target tracking technique under complex environment,a new track ing method based on hybrid iterated unsecnted particle filter (HI-UPF) and corr elation coefficients adaptive fusion scheme is proposed in this paper.First,the new algo rithm optimizes unscented transformation using the statistical linear regression method,in which way,t he new method not only improves the filtering precision,but also effectively reduces the time consumption of the pro posed algorithm.Second,a new adaptive fusion technique is taken out by using the correlation coefficients to realize the adaptive change between the product rule and weighted sum rule.Experiment of results show that the propo sed method is more reliable and robust than traditional method.