You can say '嫁给我吧!' , which means 'Marry me!'. The pronunciation is 'jià gěi wǒ ba !'
嫁 (jià) means marry

You can also say '请做我美丽的新娘', meaning 'Please be my beautiful bride'. The pronunciation is 'qǐng zuò wǒ měi lì de xīn niáng'.
新娘 (xīn niáng) means bride
美丽的(měi lì de) means beautiful

In China, its not uncommon that a man needs to own a house or flat before he can make propose. So it can be a heavy financial burden for Chinese men to get married.