Abstract: Optimal accelerated life test(ALT) plans are investigated under progressive typeⅠ interval censoring with random removals when lifetimes are lognormal distributed.The practical optimal ALTplans which minimize the asymptotic variance of the estimated qth quantile for different combinations of total number of inspections and removal probability are determined based on the ideas of equally spaced(ES) or equal probability(EP) scheme with both two and three stress levels.Numerical results are presented.Some suggestions are given to experimenters for selecting an appropriate practical plan in designing an ALTunder the proposed censoring scheme.