Getting a green card is a symbol of immigrating to the US. There are three methods to get a US green card: Family-base immigration, Employment-based immigration, and investment-based immigration.

Employment- based immigration: There are three preference categories: (EB-1) for outstanding staff,(EB-2) for the special ability people with high education or professionals,(EB-3) for the professionals, skilled workers and unskilled workers.
Investment-based immigration: There are two preference categories: EB-5 and L1A.Specific statement would be given below.

EB-5
EB-5 Visa Investment Requirements
According to EB-5 visa rules:
1. Petitioners must over 21 years old;
2. Petitionersmust have no criminal record;
3. Petitioners are required to invest as low as $1,000,000.00 for anywhere of America, and create at least 10 full-time jobs for U.S. citizens;Or petitioners are required to invest as low as $500,000.00 for a business established in a "targeted employment area", and create at least 10 full-time jobs for U.S. citizens.

Investment immigration will get a two year ‘temporary green card’ at the beginning. Investors can apply to apply to the USCIS for the abolition of conditional immigrant visa application three months before the two years green card expire date. If the investment is still existence, the USCIS will approve the permanent green card.

Transnational Manager Visa L1A
L1is a Visa for multinational managers and internal transferstaff with special skills. Basically, there are three requirements for L1:
1. Currently be, or will be doing business in America;
2. As executives or professionals working for a qualifying organization abroad for one continuous year within the three years immediately preceding his or her admission to the United States;
3. The petitioner has the financial ability to compensate the alien beneficiary and to begin doing business in the US.

When you get a visa, you can apply for a green card at any time.

Other than that, compared with EB5, the L1 visa has the following advantages:
1. Investment is less than $500,000. You decide how much you need to invest;
2. The entrepreneurs have full control of the investment during the whole time, and can translate the funds at any time;
3. Free access to America; do not have to live in America permanently;
4. Directly involved in the project operation, direct control of the company's operations.