The current study is designed as a multicenter, randomized and prospective study aiming to compare the effect of Biguard bifurcation stent system and regular stent system in patients with bifurcation lesions. Based on the previous studies, the rate of 1-year target lesion failure was around 12% after PCI with regular stent system. And the investigators previous data showed that this event at 12-month after Biguard bifurcation stent system was 4%. Considering the lost to follow-up, it is anticipated that up to 400 patients will be enrolled in the trial. All patients will have repeat angiography at 13 months, with clinical follow-up to 2 years.