Dear Sir,

If I a have Canada Work permit for 1 year i.e. L1,can I visit to my relatives who are in US from last 5 years? I hail from India and going for company assignment? Please do the needful guidance.

You have to apply for US visitor's visa, unless you are Canadian permanent resident.

Contact US embassy in Canada with proofs that you have a valid Canada work permit that is good for at least 6 months.