I started valuating company based on their free cash flow by using DCF valuation.But for some companies i came across negative free cash flow for all years. How can we evaluate company with negative cash flow using DCF valuation? and if not then what is another method for valuating such companies? (here valuation mean to calculate intrinsic value )
You can calculate companies in many different ways. In your particular situation I assume you've picked a growth stock. You can use similar competitors to value the company however it isn't reliable, therefore the payout model is good or discounted dividend model(incase of dividend).
You can also just calculate the stockholder's equity and divide it by the outstanding shares.