when i have some other nodes, it can't sync the block

as the title.
when i have 2 node
http://127.0.0.1:5000
chain:
`{
"chain": [
{
"index": 1,
"previous_hash": "1",
"proof": 100,
"timestamp": 1520730726.336663,
"transactions": []
},
{
"index": 2,
"previous_hash": "68017de6ce598dc398c5f0a4798dbcb89131f260347df5faed3e8b7afccdace1",
"proof": 161458,
"timestamp": 1520730744.8993568,
"transactions": [
{
"amount": 1,
"recipient": "86d8dd6c88b740e4854c777a4a1181b3",
"sender": "0"
}
]
}
],
"length": 2
}`
http://127.0.0.1:5001
chain:
`{
"chain": [
{
"index": 1,
"previous_hash": "1",
"proof": 100,
"timestamp": 1520730719.285117,
"transactions": []
},
{
"index": 2,
"previous_hash": "7c644d59e6db9aa7fdfd3017695e9623dd72eaec364b2c6868a8b95861b13641",
"proof": 90033,
"timestamp": 1520730754.616982,
"transactions": [
{
"amount": 1,
"recipient": "cff17fd013b24dc780c576b741dc3fdb",
"sender": "0"
}
]
},
{
"index": 3,
"previous_hash": "13cca2f4b1c7481438e96ef531b917764a680e5e73701fe9eb34afec724a0a3d",
"proof": 23126,
"timestamp": 1520730788.67462,
"transactions": [
{
"amount": 1,
"recipient": "cff17fd013b24dc780c576b741dc3fdb",
"sender": "0"
}
]
}
],
"length": 3
}`
It can't sync chain data.