public void StartEXE()
    {
        ProcessStartInfo processStartInfo = new ProcessStartInfo();
        processStartInfo.FileName = "C:/Users/Administrator/Desktop/Test/Demo.exe";
        processStartInfo.Arguments = "啟動(dòng) 程序 1 2  3";
        Process.Start(processStartInfo);
    }

private void Start()
    {
        string[] args = Environment.GetCommandLineArgs();
        text.text = args.Length.ToString();
        for (int i = 0; i < args.Length; i++)
        {
            text.text += "\n" + "Arg" + i + ":  " + args[i];
        }
    }

using UnityEngine;
using System.Runtime.InteropServices;
using System;
using System.Diagnostics; 
public class ProperWindows : MonoBehaviour
{
    [DllImport("user32.dll")]
    static extern IntPtr SetWindowLong(IntPtr hWnd, int _nIndex, int dwNewLong);
    [DllImport("user32.dll")]
    static extern bool SetWindowPos(IntPtr hWnd, int hWndInsertAfter, int X, int Y, int cx, int cy, uint uFlags);
    [DllImport("user32.dll")]
    static extern IntPtr GetForegroundWindow(); //獲取最前端窗體句柄
    [DllImport("user32.dll")]
    static extern bool ShowWindow(IntPtr hWnd, int nCmdShow);
    //[DllImport("user32.dll")]
    //static extern IntPtr GetWindowThreadProcessld(); 
    private void Awake()
    {
        //啟動(dòng)時(shí)傳過(guò)來(lái)的string數(shù)組，下標(biāo)為0的是啟動(dòng)的外部exe程序的完整路徑，下標(biāo)為1及之后的參數(shù)是想要傳過(guò)來(lái)的參數(shù)。
        string[] args = Environment.GetCommandLineArgs();
        var winInfo = JsonUtility.FromJson<WinInfo>(args[1]);
        // 設(shè)置屏大小和顯示位置
        SetWindowPos(GetForegroundWindow(), 0, winInfo.x, winInfo.y, winInfo.width, winInfo.height, 0x0040);
    }
    // Use this for initialization
    void Start()
    {
        //啟動(dòng)外部exe程序，第一個(gè)參數(shù)為exe完整路徑，第二個(gè)參數(shù)為要傳入的參數(shù)。
        string winInfo = JsonUtility.ToJson(new WinInfo(0, 0, 1000, 500));
        Process.Start(@"C:\Users\wangbo\Desktop\2\2.exe", winInfo);
    } 
    // Update is called once per frame
    void Update()
    { 
    }
}
[Serializable]
public class WinInfo
{
    public int x;
    public int y;
    public int width;
    public int height;    
    public WinInfo(int x, int y, int width, int height)
    {
        this.x = x;
        this.y = y;
        this.width = width;
        this.height = height;
    }
}