Is there any way to get accepted in PhD program without masters? I am applying for a PhD position for last few months but all the Professors say they need a masters whereas I have quite good lab experiences than a masters student even. I am very much depressed nowadays. What should I do now? If the professors do not trust the skills written in the CV, they can give a conditional offer; but they don't.
In most European countries following the Bologna process, a master's degree is a "hard" prerequisite for being accepted into a PhD program. There is no easy way around this, in large part because the PhD typically encompasses only the research phase of a standard US PhD program. By skipping or omitting the master's degree, one would have a "weaker" degree than someone who completed the master's.

Your best bet would be to find a PhD program which offers a master's program as "preadmission" to the PhD program. Not all doctoral programs offer such master's degrees, but many programs designed to attract international students will.