Hi I entere US in Apr2014, I lost my I94 and we will file I130A, I still have my passport with stamp. Is it enough evidence to prove my legal entry?

I assume that you will also be filing the I-485 adjustment of status application to permanent residence since you entered the US legally. In such case, it would be best for you to file the I-102 application at the same time that you file all of your paperwork. Due to the limitations of the Lawyers.com Forums, Alan Lee, Esq.'s (the "Firm") participation in responding to questions posted herein does not constitute legal advice, nor legal representation of the person or entity posting a question. No Attorney/Client relationship is or shall be construed to be created hereby. The information provided herein by the Firm is general, and requires that the poster obtain specific legal advice from an attorney. The poster shall not rely upon the information provided herein as legal advice nor as the basis for making any decisions of legal consequence.