Do you even understand what ICO is?
I'm guessing OP probably meant what the effects of other new cryptocurrency ICOs on bitcoin in terms of price.
As we all probably know, ICOs have been getting alot of attention from investors since the first ICO came out; millions and millions of USD worth of bitcoin and ethereum are being received by various cryptocurrency ICOs. In my personal opinion, I think ICOs has a huge effect on prices of both bitcoin and ethereum, since ICO holders most probably dump the BTC and ETH on exchanges after each cycle, effectively lowering the price of both BTC and ETH significantly. It used to be fine in the past, but as every week more and more new cryptocurrency ICOs are being announced, ICOs definitely have an negative impact in the market in terms of prices.
Bitcoin is increasing value because they are using bitcoin as payment or ethereum as payment when selling ICO ..
But it will never be a big effect if china will removed ICO because its only one country.
ICOs definitely have less impact on Bitcoin compared to Ethereum, as more ICOs prefer receiving Ethereum due to the transaction fees and transaction times, but ICOs definitely do have significant effect on bitcoin prices. Where did you get your data/information about people buying bitcoin just to invest in ICOs? Can you link me to any source? Almost everyone knows that the majority of the offerings to ICOs are Ether.
"But it will never be a big effect if china will removed ICO because its only one country." I disagree so so much. China has 4.2x the population compared to the United States of America. Also, take a look at the market volume of bitcoin alone; a huge and definitely significant percentage of the market volume is coming from China. Do your own research before making such statements.